Trailer coupler



FIG. 1 is a perspective view of a trailer coupler showing our new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a bottom view of the trailer coupler; and,

FIG. 7 is a top view thereof. 

The ornamental design for a trailer coupler, as shown. 